From: boris petkovic
Date: Fri, 10 May 2002 14:07:17 -0700 (PDT)
Subject: Re: [TSSP] Secondary voltage stress factor
Hi All, Paul wrote: > Neither Bart's coil, nor John's, has a particularly > high k factor. > When I model the induced voltage due to various > primaries, they > just don't seem to generate the kind of concentrated > EMF that > would produce localised racing arcs as John > describes: John wrote: > > the bottom 2" of the coil burned up in places from > racing > > sparks. Paul wrote: > With or without that extra 1/4" of secondary > winding, the > coupling is still pretty 'smooth'. Why should the > bottom of > the coil be clobbered like this? The most stressed > part of > the coil occurs quite a bit higher up. > > I'll throw another suggestion into the pot. At some > high > frequency the primary will be in half-wave > resonance, grounded > at both ends. Perhaps this or similar resonance is > excited by > the primary arc and couples HF energy into the part > of the > secondary close to the primary. --- Maybe high Mhz EM bursts at the begging of primary conductive state could couple locally some energy and induce enough of E-field in the very bottom of the secondary? Take a look at THOR primary current msm at : http://www.abelian.demon.co.uk/tssp/md110701 > Q: Do racing arcs ever occur on the third coil of a > base-driven > magnifier? --- I wouldn't know ,but there are people on this list that have built few mag systems.I think they have been more concerned with problem how to prevent flashover between first and second coil. Tesla reported he had occasionall flashovers (not exactly racing sparks) between extra coil turns when he used highest Eps in conection with detunung. regards, Boris __________________________________________________ Do You Yahoo!? Yahoo! Shopping - Mother's Day is May 12th! http://shopping.yahoo.com
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.